Miscellaneous Maps

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The DGS Miscellaneous Map Series includes map products addressing varied subjects in geology or hydrology that do not otherwise fall into our conventional Geologic Map or Hydrologic Map series.


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Now showing 1 - 5 of 5
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    Seismic Stratigraphy Along Three Multichannel Seismic Reflection Profiles off Delaware's Coast
    (Newark, DE: Delaware Geological Survey, University of Delaware, 1986) Benson, R.N.; Andres, A.S.; Roberts, J.H.; Woodruff, K.D
    Three multichannel, common-depth-point (CDP), seismic reflection profiles (Figures 1-3) were run off Delaware's coast (Figure 4) for the Delaware Geological Survey. Their purposes were (1) to determine the depth to the unconformity (=post-rift unconformity) at the base of the nearshore submerged Coastal Plain sedimentary rocks and (2) to relate onshore with offshore geology as interpreted from the U. S. Geological Survey's network of regional seismic profiles (Figure 5). In addition, the nearshore profiles reveal considerable detail about the nature of the Neogene lithostratigraphic units and aquifers within them that supply water to the coastal communities of Delaware and Maryland (Miller, 1971; Weigle and Achmad, 1982).
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    Cross Section Of Pliocene And Quaternary Deposits Along The Atlantic Coast Of Delaware
    (Newark, DE: Delaware Geological Survey, University of Delaware, 1999) Ramsey, K.W.
    Exploration for sand resources for beach nourishment has led to an increase in the amount of geologic data available from areas offshore Delaware's Atlantic Coast. These data are in the form of cores, core logs, and seismic reflection profiles. In order to provide a geologic context for these offshore data, this cross section has been constructed from well and borehole data along Delaware's Atlantic coastline from Cape Henlopen to Fenwick Island. Placing the offshore data in geologic context is important for developing stratigraphic and geographic models for predicting the location of stratigraphic units found offshore that may yield sand suitable for beach nourishment. The units recognized onshore likely extend offshore to where they are truncated by younger units or by the present seafloor.
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    Geologic Cross-Section of Delaware River, Red Lion Creek to Killcohook National Wildlife Refuge
    (Newark, DE: Delaware Geological Survey, University of Delaware, 1985) Talley, J.H.
    Test borings made in preparation for construction of a power line across the 2.3 miles wide Delaware River provided an opportunity to investigate the geology beneath the river which is otherwise inaccessible. The information is of value in studies of ground-water development near the River and for other engineered works as well as understanding the geologic history of a major feature of the State.
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    Map of Exposed and Buried Early Mesozoic Rift Basins/Synrift Rocks of the U.S. Middle Atlantic Continental Margin
    (Newark, DE: Delaware Geological Survey, University of Delaware, 1992) Benson, R.N.
    A series of elongate rift basins of early Mesozoic age is exposed in eastern North America in a belt extending from Nova Scotia to South Carolina. The Upper Triassic-Lower Jurassic synrift rocks that fill the basins are called the Newark Supergroup comprising continental (fluvial and lacustrine) clastic sedimentary rocks (predominantly colored red) interbedded with basaltic volcanic rocks (Froelich and Olsen, 1985). Similar basins are buried beneath the sediments of the Atlantic Coastal Plain and continental shelf.
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    Structure Contour Map of Pre-Mesozoic Basement, Landward Margin of Baltimore Canyon Trough
    (Newark, DE: Delaware Geological Survey, University of Delaware, 1984) Benson, R.N.
    The structure contour map of pre-Mesozoic basement indicates the structural complexity of the landward margin of the Baltimore Canyon trough, especially that shown by the buried rift basins of probable early Mesozoic age. Information on depth to basement is important in determining the economic limit of drilling through overlying rocks in the search for oil and gas.